WDM filter
US6229938A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2000 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Jan 31, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/12016
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a wavelength division multiplexing filter that requires lower costs, a smaller size, and a smaller amount of fiber routing operations. According to the present invention, a first module constitutes a first filter. A second module constituting a second filter is produced by connecting together circuits identical in number to a plurality of output ports of the first module, the circuits each comprising a combination of directional couplers and Bragg gratings both formed of silica-based-glass waveguides, the circuits each having a wavelength selection characteristic so as to correspond to each of the output ports. The second module is connected to the first module via an 8-fiber ribbon to simplify the integration and connection of the circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.